Control strategy for islanded operation of offshore wind power plants connected through a VSCHVDC link

VSC-HVDC links have been proposed as a means of connecting large offshore wind power plants to the onshore transmission system. This paper includes the study of a control strategy for the islanded operation of the aforementioned wind power plants. The offshore grid voltage is controlled independently of the HVDC link state. Therefore, offshore grid and HVDC link overvoltage due to onshore short circuits are largely reduced. Moreover, the proposed strategy allows for the contribution of the wind power plant to onshore service restoration after a power outage. The proposed control strategy has been validated in a realistic scenario by means of PSCAD/EMTDC simulations.